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How does NaCN act as a depressant in pre...

How does NaCN act as a depressant in preventing ZnS from forming the froth?

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NaCN combines withZnS to form a complex .Na_2[Zn(CN)_4]. ōn the surface of .^circ ZnS. and this preyents it from formation of frotli. .ZnS+4 NaCN^+ rarr Na_2[Zn(CN)_4]+Na_2 ~S_t ~m. Sodium tetracyanozinçite (I1) -
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